Most living creatures are bound by the fact of birth, aging and death. Few, however, have evolved to break the typical life cycle.
The aptly named immortal jellyfish (Turritopsis dohrnii) is one such animal — and, in a surprise discovery now published in Proceedings of the National Academy of Sciences, scientists have added its cousin, the comb jellyfish (Mnemiopsis leidyi), to the coveted forever young club.
Researchers at the University of Bergen in Norway realized they had a de-aging specimen in their lab when they found a larval ctenophore in a tank where a mature comb jellyfish was supposed to be.
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